1265423361 has 16 divisors (see below), whose sum is σ = 1763030016. Its totient is φ = 805817936.

The previous prime is 1265423359. The next prime is 1265423371. The reversal of 1265423361 is 1633245621.

It is a cyclic number.

It is not a de Polignac number, because 1265423361 - 2¹ = 1265423359 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1265423371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38926 + ... + 63608.

It is an arithmetic number, because the mean of its divisors is an integer number (110189376).

Almost surely, 2^1265423361 is an apocalyptic number.

It is an amenable number.

1265423361 is a deficient number, since it is larger than the sum of its proper divisors (497606655).

1265423361 is a wasteful number, since it uses less digits than its factorization.

1265423361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25452.

The product of its digits is 25920, while the sum is 33.

The square root of 1265423361 is about 35572.7896150977. The cubic root of 1265423361 is about 1081.6297299860.

Adding to 1265423361 its reverse (1633245621), we get a palindrome (2898668982).

The spelling of 1265423361 in words is "one billion, two hundred sixty-five million, four hundred twenty-three thousand, three hundred sixty-one".